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No, from the description here I think you're looking at J6, the 5-pin IO Extension Connector. The serial pins are on J3, the Main Header. That's the row of 6 pins next to the 3.5mm jack socket.

Yes that’s correct - I’ve used these big 2.54 mm pin so that they fit well with the type of connectors provided with usb to serial. Hopefully, with the first batch, we will have WiFi-based setup ready Now we still have the issue of the very first download that I don’t know yet how to solve

Hi Philippe - can you give me a couple of pointers? I've connected up to the serial pins using a USB-to-serial adapter, and I'm using Coolterm on my Macbook to try to communicate. When I connect with 115200 8-N-1 I can see a regular sequence of characters coming from the device, but they don't make sense to me - as though the baud rate is wrong (other baud rates don't make them any clearer), or simply that's it's a binary sequence rather than plain text.

Hi Philippe - can you give me a couple of pointers? I've connected up to the serial pins using a USB-to-serial adapter, and I'm using Coolterm on my Macbook to try to communicate. When I connect with 115200 8-N-1 I can see a regular sequence of characters coming from the device, but they don't make sense to me - as though the baud rate is wrong (other baud rates don't make them any clearer), or simply that's it's a binary sequence rather than plain text.

Yes the unit has firmware in it. Usually, when you have garbage at 115200,n,8,1 it means that the GND has not been connected between the USB-to-Serial the board

Thanks. GND is connected - I have three wires: GND, RX and TX.

The garbage is repeatable, so I don't think it's caused by 'floating' voltages. The USB-to-serial adapter keeps crashing my Macbook when I remove the USB cable, so I'm going to bring a Windows laptop home for the weekend.

The garbage is repeatable, so I don't think it's caused by 'floating' voltages. The USB-to-serial adapter keeps crashing my Macbook when I remove the USB cable, so I'm going to bring a Windows laptop home for the weekend.

Then it should work. I mentioned the GND problem because it happened to me twice, my wire was not connected properly (on the USB-to-serial board) and I banged my head against the wall a while with all permutations & combinations of serial speed & format before I realized GND was incorrect.

Given the way this USB-to-serial adapter is crashing my Macbook, it's possible that it's faulty, so I'm going for belt-and-braces; I've dug out another adapter (different model), and I've found a Windows 10 laptop, and I'll give these a try over the weekend.

What should I expect to see when I connect? At the moment, I see a screen or two of output when I press the reset button, and then every few seconds I see a line or two of repeating output. Assuming it's just that the characters in this output are not being correctly interpreted, does that pattern of output make sense?